CMAKE_PREFIX_PATH is not working with Android

noone

I have compiled Qt 5.15.2 from git for android (only for armeabi-v7a) and now I'm trying to compile my Qt5 app for Android. QtCreator used to compile to android just fine but stopped working cause QTCREATORBUG-23898. So i wanted to compile my app from terminal.

Here is what I came up with:-

export QT_ROOT=/path/to/qt/installation
export THIS=/home/kol/untitled/build
export ANDROID_API=21
export TOOLCHAIN=$ANDROID_NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi

export CMAKE_PREFIX_PATH=$QT_ROOT/lib/cmake/Qt5

ls $CMAKE_PREFIX_PATH

cmake -GNinja .. \
    -DANDROID_SDK=$ANDROID_HOME \
    -DCMAKE_ANDROID_NDK=$ANDROID_NDK \
    -DANDROID_NATIVE_API_LEVEL:STRING=$ANDROID_API \
    -DANDROID_ABI=armeabi-v7a \
    -DANDROID_STL=c++_shared \
    -DANDROID_TOOLCHAIN=clang \
    -DCMAKE_TOOLCHAIN_FILE:PATH=$ANDROID_NDK/build/cmake/android.toolchain.cmake \
    -DCMAKE_CXX_COMPILER=$TOOLCHAIN$ANDROID_API-clang++ \
    -DCMAKE_C_COMPILER=$TOOLCHAIN$ANDROID_API-clang \
    -DCMAKE_PREFIX_PATH=$CMAKE_PREFIX_PATH
    -DCMAKE_SYSTEM_NAME=Android \
    -DQT_QMAKE_EXECUTABLE=$QT_ROOT/bin/qmake \
    -DCMAKE_BUILD_TYPE=Release

this gives me following:-

Qt5Config.cmake  Qt5ConfigVersion.cmake  Qt5ModuleLocation.cmake
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /optHDD/AndroidNDK/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:27 (find_package):
  Could not find a package configuration file provided by "QT" with any of
  the following names:

    Qt6Config.cmake
    qt6-config.cmake
    Qt5Config.cmake
    qt5-config.cmake

  Add the installation prefix of "QT" to CMAKE_PREFIX_PATH or set "QT_DIR" to
  a directory containing one of the above files.  If "QT" provides a separate
  development package or SDK, be sure it has been installed.


-- Configuring incomplete, errors occurred!
See also "/home/smit/untitled/build/CMakeFiles/CMakeOutput.log".
You have changed variables that require your cache to be deleted.
Configure will be re-run and you may have to reset some variables.
The following variables have changed:
CMAKE_CXX_COMPILER= /optHDD/AndroidNDK/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi21-clang++

-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    ANDROID_SDK


CMake Generate step failed.  Build files cannot be regenerated correctly.

the ls command clealy shows Qt5Config.cmake exists in given CMAKE_PREFIX_PATH but cmake is still not finding it.

EndrII 0

i have a some problem. Does anyone have any solution?

EndrII 0

my build status
variable and cmake command.

cmake -DCMAKE_PREFIX_PATH=$QTDIR -DQT_DIR=$QTDIR -DQT_QMAKE_EXECUTABLE=$QTDIR/bin/qmake -DANDROID_ABI=arm64-v8a -DANDROID_BUILD_ABI_arm64-v8a=ON -DANDROID_BUILD_ABI_armeabi-v7a=ON -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_ROOT/build/cmake/android.toolchain.cmake .
 in dir /root/worker/cmakeAndroid/AndroidCMakeBuilder/build (timeout 1200 secs)
 watching logfiles {}
 argv: b'cmake -DCMAKE_PREFIX_PATH=$QTDIR -DQT_DIR=$QTDIR -DQT_QMAKE_EXECUTABLE=$QTDIR/bin/qmake -DANDROID_ABI=arm64-v8a -DANDROID_BUILD_ABI_arm64-v8a=ON -DANDROID_BUILD_ABI_armeabi-v7a=ON -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_ROOT/build/cmake/android.toolchain.cmake  .'
 environment:
  ANDROID_API_VERSION=30
  ANDROID_HOME=/root/snap/androidsdk/current/AndroidSDK
  ANDROID_NDK_ROOT=/root/AndroidSDK/ndk/21.3.6528147
  ANDROID_SDK_ROOT=/root/AndroidSDK
  HOME=/root
  JAVA_HOME=/usr
  LANG=C.UTF-8
  LD_LIBRARY_PATH=:/root/Qt/5.15.0//android//lib
  LESSCLOSE=/usr/bin/lesspipe %s %s
  LESSOPEN=| /usr/bin/lesspipe %s
  LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:
  OLDPWD=/root/worker
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/root/Qt/5.15.0//android//bin
  PWD=/root/worker/cmakeAndroid/AndroidCMakeBuilder/build
  QTDIR=/root/Qt/5.15.0//android/
  SHLVL=2
  TERM=xterm-256color
  USER=root
  _=/usr/local/bin/buildbot-worker
  container=lxc
 using PTY: False
-- ANDROID_PLATFORM not set. Defaulting to minimum supported version
16.
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /root/AndroidSDK/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
using ccache in /usr/bin/ccache
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /root/AndroidSDK/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
 LIB_OUTPUT_DIR = /root/worker/cmakeAndroid/AndroidCMakeBuilder/build/Patronum/QuasarAppLib/build/Release
-- buid type    Release
-- Project      QuasarApp
-- c compiler   /root/AndroidSDK/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/bin/clang
-- cxx compiler /root/AndroidSDK/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++
-- build shared 
-- qmake exec   /root/Qt/5.15.0//android//bin/qmake
CMake Error at Patronum/QuasarAppLib/CMakeLists.txt:37 (find_package):
  Could not find a package configuration file provided by "QT" with any of
  the following names:

    Qt6Config.cmake
    qt6-config.cmake
    Qt5Config.cmake
    qt5-config.cmake

  Add the installation prefix of "QT" to CMAKE_PREFIX_PATH or set "QT_DIR" to
  a directory containing one of the above files.  If "QT" provides a separate
  development package or SDK, be sure it has been installed.


-- Configuring incomplete, errors occurred!
See also "/root/worker/cmakeAndroid/AndroidCMakeBuilder/build/CMakeFiles/CMakeOutput.log".
program finished with exit code 1
elapsedTime=0.466865

SGaist

Hi,

The CMAKE_PREFIX_PATH should contain the path to where the Qt cmake files are located.

EndrII 0

I find solution
Your need to add qt path into CMAKE_FIND_ROOT_PATH variable.

cmake -DCMAKE_FIND_ROOT_PATH=yuor/qt/path .

i think that trouble in the android.toolchain.cmake file. This toolchain overwrite the CMAKE_PREFIX_PATH variable.